Search for missing To: header?

Joseph Tam via dovecot <[email protected]>
Newsgroups gmane.mail.imap.dovecot
Message-ID <323189b3-e57c-ea52-1fba-1bcd8f8dd1fe@nodomain>
Is there a proper way to torture doveadm search query to look for
messages with a missing "To:" header?  I played around with
it and this seems to work:

 	doveadm fetch -A text mailbox {box} NOT TO ''

(Looking through a large spam corups: spam often exclude recipients
in the headers as it gives the game away their personalized fraud was
blasted to hundreds of addresses.)

Joseph Tam <[email protected]>
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